Quectel EC21 Series User Manual

LTE Standard Module Series
EC21_Series_Hardware_Design
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20. Updated storage information in Chapter 8.1
1.6 2019-04-30
Woody WU/
Nathan LIU/
Frank WANG
1. Added new variants EC21-EU and related
information.
2. Updated star structure of the power supply in Figure
8.
3. Updated power-on scenario of module in Figure 12.
4. Updated reference circuit with translator chip in
Figure 20.
5. Added timing sequence for entering emergency
download mode of USB_BOOT interface in Figure
32.
6. Updated GNSS frequency in Table 29.
7. Updated antenna requirements in Table 30.
8. Added EC21-EU current consumption in Table 41.
9. Added EC21-EC current consumption in Table 42.
10. Updated EC21-E conducted RF receiving sensitivity
in Table 44.
11. Updated EC21-A conducted RF receiving sensitivity
in Table 45.
12. Updated EC21-V conducted RF receiving sensitivity
in Table 46.
13. Updated EC21-AUT conducted RF receiving
sensitivity in Table 47.
14. Updated EC21-AU conducted RF receiving
sensitivity in Table 51.
15. Added EC21-EU conducted RF receiving sensitivity
in Table 52.
16. Added EC21-EC conducted RF receiving sensitivity
in Table 53.
17. Updated recommended stencil thickness as
0.18mm–0.20mm and reflow soldering thermal
profile in Chapter 8.2.
1.7 2019-08-19
Ward WANG/
Owen WEI
1. Added ThreadX variant EC21-AUX and updated
related information in Table 1 and Chapter 2.1.
2. Deleted the information of GNSS supported on
EC21-EC in Table 1
3. Updated supported protocols and USB serial driver
in Table 2.
4. Updated functional diagram in Figure 1.
5. Updated notes in Chapter 3.7.1.
6. Updated EC21-E current consumption (GSM voice
call) in Table 34.
7. Updated EC21-EU current consumption in Table

Quectel EC21 Series Specifications

General

Brand	Quectel
Model	EC21 Series
Category	Control Unit
Language	English